<canvas id="canvas" width="100" height="100"></canvas>
<script>
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
ctx.fillStyle = '#0f0';
ctx.scale(-1, -1);
ctx.filter = 'drop-shadow(0px 10px black)';
ctx.fillRect(-75, -65, 50, 40);
</script>
